Thermostatic fire-alarm.



No. 688,213. Patented Dec. 3, IQOI.

H. C. VIEBKANT.

THERMOSTATIC FIRE ALARM.

(Application filed Mar. 18, 1901.)

(N0 Model.)

UNITED STATES PATENT OFFICE.

HERMAN C. VIERKANT, OF TARRYTOVN, NEYV YORK.

THERMOSTATIC FIRE-ALARM.

SPECIFICATION forming part of Letters Patent No. 688,213, dated December 3, 1901. Application filed March 18, 1901. Serial No. 51,726. (No model.)

To all whom, it may concern.-

Be it known that I, HERMAN O. VIERKANT, a citizen of the United States, residing at Tarrytown, in the county of Westchester and State of New York, have invented certain new and useful Improvements in Thermostatic Fire-Alarms; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The invention relates to an automatic firealarm of the thermostat type.

The object of the invent-ion is to produce an alarm of this character which differs from that shown and described in my application for patent filed herewith, Serial No. 51,725, in that instead of using a spring-actuated train of gearing for sounding the alarm I substitute in lieu thereof an electric alarm, which enables the alarm to be placed at a great distance from the building or room in which the thermostat is arranged.

With this and other objects in view the invention consists of certain novel features of construction, combination, and arrangement of parts, which will be hereinafter more fully described, and particularly pointed out in the appended claim.

In the accompanying drawings, Figure l is a diagrammatic view of the fire-alarm and bell circuit; and Fig. 2 is a detail perspective view of the thermostat-tube, the upper end of the stem, the bracket, and the springtongue.

Referring to the drawings, a denotes the body of the thermostat, consisting in the pres ent instance of a tube a, provided with a removable cap a b designates the plunger-stem of the thermostat, projecting upwardly from the plunger a through the cap, a coiled spring a" being confined between the plunger and cap and exerting its energy to force the plunger downwardly, The tube a is adapted to contain a fluid or other agent sensitive to heat and capable of quickly expanding and contracting by the changes of temperature, and thus when expanding elevate or lift the plunger and when contracting permit the spring to lower the plunger. The movable stem Z) of the thermostat is provided at its free end with a tapering insulated point 0'.

cl denotes the electric bell installed within the bell-circuit e, the wires g and 72 of which are connected to bindingposts 2' and 70, secured to a bracket Z, fixed to the cap of the thermostat-tube.

n denotes the spring-tongue, which is electrically connected to the binding-post 7c and insulated from the bracket by a washer m. This tongue has a notched or forked downwardly and outwardly bent free end to receive the taperinginsnlated point 0. The current from the battery when the spring-tongue is pressed is through the bell, the binding-post t, thebracket Z, the spring-tongue n, the hinding-post is, back to the battery.

In operation when the thermostat reaches a certain degree of temperature the stem will be forced upward and its tapering insulated end, coming in contact with the downwardlyprojecting toes of the tongue, will force said tongue into contact with the bracket, thus closing the circuit and sounding the alarm, which alarm is previously set and may be located at any distance from the house or building in which is located the thermostat. For instance, the thermostat may be located in a factory, while the alarm maybe located miles away in a private residence of the owner or superintendent of the factory, so that should fire break out he would be notified.

From the foregoing description, taken in connection with the accompanying drawings,

the construction, mode of operation, and advantages of myinvention will be readily understood without requiring a more extended explanation.

Various changes in the form, proportion, and details of construction may be made with in the scope of the invention without departing from the spirit or sacrificing any of the advantages thereof.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-

The combination, in a fire-alarm, of a thermostat having a stem provided with an insulated tapering point, a coxnlucting-bracket connected to the thermostat, an electric circuitincluding an alarm and conducting-wires,

2 seems one of Which is eiectrioaiiy connected with the 1 moves outwardly, the tongue is forced into braoket,abinding-post connected to and insu- I contact with the bracket, substantially as delated from the breeket and having the other scribed. conducting wire attached thereto, and a i In testimony whereof I have hereunto set 5 spring-tongue secured by said binding-postto my hand in presence of two subscribing wit- IS the bracket and insulated therefrom, said nesses. tonguehavingafreecnd normally maintained l by its spring action out of contact with the i Witnesses:

HERMAN C. VIERKAN T.

bracket and notched to receive the said taper- F. C. HUSTED, 1o ing point of the stem, whereby, when the stem ARTHUR HUMPHREYS. 

